Machine for copying shoe lasts and other irregular bodies



July 14, 1925. I v 1,545,543

c. BLACK ET AL MACHINE FOR COPYING SHOE LASTS AND OTHER IRREGULAR BODIES Filed Aug. 6, 1923 .2 Sheets-Sheet l 10 Z9 M T JNVENTURS'- MM July 14, 1925. v 1.545.543

C. BLACK ET AL I MACHINE FOR cormze saom LASTS AND OTHER IRREGULAR aonms Filed Aug. 6, 1 2 Sheets-Sheet 2 Patented July 14, 1925.-

cause PArE-nr' CARI BLACK, or MonK-EBERG,

a a A i L memes. at; or Annmari LErnE, GERMANY, nssrenons o UNITED snon vfIAoHInERY oonromrron, as

:PA'TERson; NEW JERSEY, A CORPORATION on NEW JERSEY.

MACHINE we ooPYIne SHOE LASTS Ann oErHER IRREGULAR smarts.

Application filed August 6, 152's. serial No 656,142.

To all whom it may concern:

Be it known that We,- CARL BLACK and CARnBnN'soHn'InT, J 12, citizens of Germany, residing at Monkeberg and Alfeld on-the 'Leine; Germany have invented certain new and useful Improvements in Machines for Cop ing Shoe Lasts and Other Irregular Bodies (for which Ihave' filed an application in Germany July 27, 1922), of which the following is" a specification; This invention relates to pattern copying lathes and is disclosed in connection With a lathe for turning shoe lasts of the type set forth in United States Letters Patent No. 544,891, granted Aug. 20, 1895, (inapplication of W. F. Gihnan. v r

' Last lathes have ordinarily been providedtwith a cutter head? about ten inches diameter, a construction which possesses marked economic and manufacturing adimage's. Diffi'culty has-"been experienced in the use of last lathes of this typ'e' in re: producing concavities of sharp curvature in" lttsts, for the reason that the model Wheel of such a last lathe (Which is of the same diameter and onan axis parallelto that of theniodeb bridges over such concavitie's and consequently no" concavity of sharper cur- Vaturethan that of the model Wheel will be reproduced in the block; WVhile the construction and use of a model Wheel of sharp curvature offers nog'reat difiiculty, that of a similar cutter does; Such concayities have to be finished out later by hand,- Which is a source of considerable expense and inaccuracy. The present invention meets this-difa ficulty by tilting the axis of the cutter until it stands at a substantialf vertical angle with the rotation axis of the'block or Work piece. Thus the effective shape of the cutter, which is'the projection-of its periphery on a plane perpendicular to the rotation axis or the block, becomesan ellipse with a point ator' near its end in contact With the block; this end having obviously a much sharper curvaturethan that of the cutter itself. The model Wheel; for most accurate reproduction,- Will be o'fthe same size and have the same relation tothe rotation axis of the model; The difi'iculty is therefore minimized Without loss of the advantages ofthe large cutter head construction. p Therefore, an important feature o'f th'e invention'consists in a copying lathe haying aniodel wheelga cutest-and means for Hold mg and rotating a model and block against them respectively, the axis of" the cutter b'e ng vertically inclined to that or the B10 1n order to transfer-maths efl-ebuve content of the cutter to* an ellipse so si uated that that portion of th' jellipse u -hichfis' in" co'if tactwith the block is of substantially sharper curvature than the periphery" of the" cutter "itself. Thus we are able to secure accuraterepro'dhhtion of sharp coneavmes gx'jith a large cutter header cheap construe i This ha other features or: theiaveautu" comprising certaincombinations and a r range-merits of parts Will be understood"fr'ofn the following description of a preferred em bodnnent the eotselected' for purposes or illustration and shown in the accompanying a drawings in which, i

Figure is a front elevation;

F g.'2-"-isa-left'handside elevation;

Ijigs 3 and 4: are} diagrams illustrating M the ordlnary cutter head arrangement; Fig-L" a front-end Fig. 4- a sideeleyation r an Figs. 5 and G are similar diagrams illustrating the cutter head arrangement in ace corda'nce Withth'e preferred embodiment of the present invention; F ig. 5 being a from;

andYFig. 6a side elevation. v I

In Flgs. 8-'6,T represents the model Wheel? (or cutter) and M represents the model (or block, or workpiece)respectively."

Referring to Figs. 1 and 2; which Show" the completemachine; the last" W is out" from a pattern Mg commonly terinec'l a model? by means of a high-speed" niillinglieador cutter F. The pattern M is-secured between dogs 1, 2; the Work between dogs? an d' l; and'both are uniforinlyrotat'ed froi'ri'a shaft J5 5" by gearing 6, 7 and 8, 9.' Their axes of rotation are collinear, as is ell knovvni it is desired to produce from a pattern a left use; the direction oifrota non of thewood block M is inade opposite to the direction" of" rotation of the pattern by cutting in reversing gear, in" the usual manner. The two supporting devices for the pattern and the Work are secured in a carriage 1Q; Whiehis capable of moving onja rectilinear slide upeni the fr'ah e'A in ai di rection at right angles to the axis of pattern and Work. Thepattern M is pressed against by that portion of the ellipse which is in contact With the block is of substantially sharper curvature than the periphery of the cutter itself.

3. In a pattern copying lathe, a model Wheel and a cutter, and a model holder and a block holder arranged to hold a model and a block for rotation against them respec tively, the axes of rotation of the model.

Wheel and cutter being tilted at oblique angles to the axes of the model and block in planes not intersecting the model and block axes respectively.

4. In a pattern copying lathe, a model wheel and a cutter, and a model holder and a block holder arranged to hold a model and a block for rotation against them respectively, the axes of rotation of the model Wheel and cutter being tilted out of parallelism to i the axes of the model and block in planes perpendicular to the planes defined by the model axis and model Wheel center, and the block axis and the cutter center, respectively.

5. -In a pattern copying lathe, model and block holders arranged to rotate on horizontal axes, and a model Wheel and a rotating cutter, the axis of rotation of the cutter forming a vertical angle with the axis of the block.

In testimony whereof We affix our signatures in presence of two Witnesses.

CARL BLACK. CARL BENSCHEIDT, JR. Witnesses:

FRANCIS J. DUGAN, GHAs. S. GRAHAM. 

